Is it possible to log in to Google Voice to edit settings????

I had taken 2 "Google" phone numbers quite some time back. For one I got a message that if I do not use immediately, it will get deactivated and for another that I have been using and my calls on that number were getting forwarded to 2 mobile numbers both AT&T, suddenly it has been forwarding only to one At&T phone. Accessing Google voice messages is a pain. When messages have bee left, Google voice says "There are no message". I now want to go and change my Google voice settings but the damn thing does not allow me to login via any feature!! I am logged into my gmail account, yet when I go to Voice and click, it throws up a dialog box which allows only 2 features- create a new ph number or check if you can use existing mobile number. Everything else is disabled. How do I go into my Google Voice Settings? I find it hard to believe that this poor quality product is a Google product.